Thanks for that. I've printed countless negs developed in staining devs on VC papers with no problems-usually Kentmere and Forte, which don't have the softened highlights of MG4.
Re fixers-I'll probably use an alkaline one anyway because it washes out more easily and may well help give more stain-initial trials with TF3 promising.
In the past I've tried Dixactol with Delta 3200 but the results were a bit thin and foggy. Perhaps PCAT for 18 mins at 3200 will be a good start-with a quick look with a green safelight at 12 mins or so.